analyses WordFetcher program

Download WordFetcher (freeware) and it's source. Wordfetcher allows you to select a doc (word, pdf, etc.) and a string and it will find that string and display it, highlighted in another winder. The code is a bit complex. I want someone to trace down where this document is found, parsed, and placed in the window and put comments in those locations for me. Coding not required - just understand java